Hi and welcome to the forums. To get a rough estimate of how much cooling capacity you need, measure the current on every electrical circuit supplying power to the racks. Total amps x voltage x 3.413 = BTUs.
For actual requirements, an engineer familiar with data centers will consider other factors that affect cooling -- including rack layout, air flow, CRAC placement, humidity, your uptime needs, etc. -- and design a complete cooling system.
Ken
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DR/BC Planner
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